Readd support for reading in direct CSV exports from Radio Reference

[devicenull]

The RadioReference.com talkgroup CSV format is not very different then the one trunk-recorder expects. This patch adds support for using the CSV exported directly from RadioReference, while still supporting the custom trunk-recorder format. It detects a RadioReference format file by looking for (and ignoring) the header line it inserts.

[robotastic]

This is a great idea! Could you include/attach a sample .csv file from radio reference, so I can test it out? I really have to upgrade sometime so I can download the .csv files.

[devicenull]

Sure, sample attached.

demo.csv

[robotastic]

So - Slight wrinkle... in the talkgroups, the mode is a char variable. It can only work with a single character, so A, D, & E work, but TE is a problem. And I actually just checked my local system and they are using DE for encrypted channels. I will go work on changing it around so that mode is a string.

[JoeGilkey]

Performance wise, making the mode an enum would be better.

[robotastic]

Ok - I think I have things working. Merging in... thanks!
Can you check audioplayer.php? There was a conflict and I think I fixed things but may have messed it up.